Quoting Chris Wilson (2020-12-03 22:38:49)
> Since rc6 is sampling the device registers, we try to acquire the device
> wakeref. However, since i915_pmu_enable may be called from hardirq, we
> cannot actually wake the device up. So let's not, and hope our gt wake
> tracking is accurate.
drm/i915/pmu: Correct the rc6 offset upon enabling
The rc6 residency starts ticking from 0 from BIOS POST, but the kernel
starts measuring the time from its boot. If we start measuruing
I915_PMU_RC6_RESIDENCY while the GT is idle, we start our sampling from
0 and then upon first activity (park/unpark) add in all the rc6
residency since boot. After the first park with the sampler engaged, the
sleep/active counters are aligned.
v2: With a wakeref to be sure
Closes: https://gitlab.freedesktop.org/drm/intel/issues/973
Hmm. Take 2.
-Chris
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